A prospectus is one of the richest troves of information about a company that you could hope for. Companies that have been private for years – like Facebook – have to disclose everything from their business history to their financial statements to a list of every single thing they think could go wrong with their company. They talk about their legal entanglements, their founders, how much their executives get paid, the fees they’re paying their banks, and other wonderful bits of information that help investors – and, ahem, reporters – understand a company much better. 
jennydeluxe:
tl;dr: basically, when Facebook files for IPO tonight, it will be like Christmas morning for tech reporters.
I’m personally pretty interested in all this info, too. I think anyone currently working in tech or at a company that might have future dealings with Facebook, whether through applications, “social marketing,” or anything else, should probably care, too?
(Not to mention anyone who has any information shared on Facebook. I mean…. right?)